Display screen or a portion thereof with graphical user interface



The FIGURE is a front view of a display screen or a portion thereof with graphical user interface showing my new design.

The broken line showing of the phone and the display screen or a portion thereof is for the purpose of illustrating environment and forms no part of the claimed design. The broken line showing of elements on the display screen illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof with graphical user interface, as shown and described. 